A method for preparing a high-nickel single-crystal cathode material modified by phosphomolybdic acid
A positive electrode material, phosphomolybdic acid technology, applied in the field of materials, can solve the problems of active material damage of positive electrode materials, short solid-phase mixing time, difficulty in forming surface equalization, achieve high specific capacity and cycle stability, improve service life, good stability effect
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Embodiment 1
[0047] Preparation of positive electrode material: Prepare an absolute ethanol solution containing 6.2g / L phosphomolybdic acid at room temperature 25°C, take 3ml for later use; weigh 2g single crystal NCM811 and disperse it in the above 3ml phosphomolybdic acid absolute ethanol solution, and Stir until the ethanol evaporates naturally, and grind it with a mortar to obtain a powder; put the powder in a corundum scorpion, and in an oxygen atmosphere, heat up to 700°C in a tube furnace for 13 hours at a rate of 5°C / min. After cooling to room temperature, the positive electrode material was obtained by grinding with a mortar.
[0048] Battery assembly: Mix the prepared high-nickel single crystal positive electrode material, conductive carbon (SP) and polyvinylidene fluoride (PVDF) at a mass ratio of 90:5:5 to make a slurry, and evenly coat it on the aluminum foil assembly The positive electrode membrane is obtained on the fluid. With metal lithium sheet as negative electrode, pol...
Embodiment 2
[0053] Prepare an absolute ethanol solution containing 12.5g / L phosphomolybdic acid at room temperature 25°C, take 3ml for later use; weigh 2g single crystal NCM811 and disperse it in the above 3ml phosphomolybdic acid absolute ethanol solution, stir in the air until the ethanol Naturally evaporate to dryness and grind with a mortar to obtain powder; put the powder in a corundum casket, under an oxygen atmosphere, heat up to 700°C at a rate of 5°C / min and calcinate for 13 hours in a tube furnace, then cool naturally to room temperature The positive electrode material was obtained by grinding with a mortar. A button battery was assembled using the same process as in Example 1.
Embodiment 3
[0055] Prepare an anhydrous ethanol solution containing 25g / L phosphomolybdic acid at room temperature 25°C, take 3ml for later use; weigh 2g single crystal NCM811 and disperse it in the above 3ml anhydrous ethanol solution, stir in the air until the ethanol evaporates naturally, use The powder was obtained after grinding with a mortar; the powder was placed in a corundum casket, and calcined in a tube furnace at a rate of 5 °C / min to 700 °C for 13 hours in an oxygen atmosphere, cooled naturally to room temperature, and ground with a mortar to obtain Cathode material. A button battery was assembled using the same process as in Example 1.
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